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Sixteen weaning pigs were assigned to one of two treatments including standard starter diet for 21 days or antibiotic-supplemented diet (10\u2009g oxytetracycline\/100\u2009kg body weight\/day) for 7 days, followed by 14 days of standard starter diet. Feces were\u00a0collected from the pigs on days 0, 8, and 21 for microbiota and resistome profiling. Pigs receiving oxytetracycline exhibited a significantly greater richness (ANOVA, P\u2009=\u20090.034) and diversity (ANOVA, P\u2009=\u20090.048) of antibiotic resistance genes (ARGs) than the control pigs. Antibiotic administration significantly enriched the abundances of 41 ARGs, mainly from the tetracycline, betalactam and multidrug resistance classes. Compositional shifts in the bacterial communities were observed following 7 days of antibiotic adminstration, with the medicated pigs showing an increase in <jats:italic>Escherichia<\/jats:italic> (Proteobacteria) and <jats:italic>Prevotella<\/jats:italic> (Bacteroidetes) populations compared with the nonmedicated pigs. This might be explained by the potential of these taxa to carry ARGs that may be transferred to other susceptible bacteria in the densely populated gut environment. 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BIOMIN is involved in natural feed additive development and research in natural alternatives of in-feed medication in livestock production.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing Interests"}}],"article-number":"4062"}}